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In intra video coding, intra frames are predicted with intra prediction and the prediction residual signal is encoded. In many transform-based video coding systems, intra prediction residuals are encoded with transforms. For example, the Discrete Cosine Transform (DCT) and the Asymmetric Discrete Sine Transform (ADST) are used for intra prediction residuals in many coding systems. In the recent work,...
In many video coding systems, motion compensation is used to reduce temporal correlation. Motion-compensated residuals are encoded with transforms. In this paper, we develop transforms for motion-compensated residuals based on prediction inaccuracy modeling. Specifically, we observe that motion-compensation is very effective in smooth regions and still regions. In regions where strong motions occur,...
With a proper transform, an image or motion-compensated residual can be represented quite accurately with a small fraction of the transform coefficients. This is referred to as the energy compaction property. When multiple transforms are used, selecting the best transform for each block that leads to the best energy compaction is difficult. In this paper, we develop two algorithms to solve this problem...
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